I was trying to figure out a couple days ago how much a difference there is between flywheel hp and rear wheel hp. Say you take an LLY 310hp or anything and want to see how much rwhp it is, how do you do that? I'm not good with ratios and all that so I'm asking you guys. Thank's

I will give you an example.......

LB7 is rated at 300 HP and 520 TQ.....

I have seen most trucks on a DYNO-JET come in at 235-245 RWHP and 420-440 RWTQ.....

So the HP loss thru the Auto to the wheels is 20% and the TQ is close to the same......

So I would guees the LLY would fall in that range as well.

T:cool: NY

I can't believe it drops that much from the flywheel back to the wheels. I know you figure in all the moving parts. So if you wanted to make at least 415rwhp with an LLY you'd definetely have to have more than 125 additional hp.

Way back in prehistoric times, power loss through an old TH400 could be more than that.....

Tom

Read this:

http://www.diablosport.com/horsepower.php

Read this:

http://www.diablosport.com/horsepower.php
thanks for the post. A good explanation.

I have seen several stock dmax run on dynos at about 228 - 235 rwhp but don't recall the TQ nos.

The losses that occur in the drivetrain between the flywheel and the rear wheels is not accurately represented by percentage for all power levels. Say that a LB7 is 300/520 at the flywheel and 245/440 at the rear wheels. If you add 30hp/70tq to the engine then that should also be the increase at the rear wheels, like 275/510, since the losses that occur in the drive train have all ready been overcome. Just because you add power to the engine does not mean that the drivetrain becomes more inefficient. In the above link they talk only of the factory advertised hp and rear wheel hp. Do you think it makes sense to say that an engine makes 300 hp and looses 55 to the drivetrain so the rear wheel is now at 245, But if I add 60 hp to the engine (20 % gain of power overall) the I also loose an additional 12 hp in the drivetrain (loss of 20% of the added power) so that the net gain at the rear wheels was 48 hp? What was the cause of the drivetrain requireing an extra 12 hp just because there was extra hp on tap at the engine.

One also needs to remember that the factory advertises Flywheel horsepower with no accessories. So when you add a power steering pump, alternator, A/C, fan and extras they all take power. What this means is all that lost power is not going up in the driveline.

So does that mean the Duramax has about the same rwhp as the 98.5-02 24v flywheel hp when stock?

What is a "98.5 - 02 24v"?

Why are you questioning D**ge hp/trq and GM hp/trq numbers? Does not make sense unless you are thinking about buying a goat...

Why are you questioning D**ge hp/trq and GM hp/trq numbers? Does not make sense unless you are thinking about buying a goat...
):h ):h ):h lmao

No goat roping for me. All Chevrolet here, I was just trying to see if the rwhp stock#'s compared to Dodge24v flywheel numbers. Also could somebody answer my question about how much difference is flywheel versus rwhp?